CVE-2020-3509: Cisco IOS XE Software for Cisco cBR-8 Converged Broadband Routers DHCP Denial of Service Vulnerability
First published: Thu Sep 24 2020(Updated: )
A vulnerability in the DHCP message handler of Cisco IOS XE Software for Cisco cBR-8 Converged Broadband Routers could allow an unauthenticated, remote attacker to cause the supervisor to crash, which could result in a denial of service (DoS) condition. The vulnerability is due to insufficient error handling when DHCP version 4 (DHCPv4) messages are parsed. An attacker could exploit this vulnerability by sending a malicious DHCPv4 message to or through a WAN interface of an affected device. A successful exploit could allow the attacker to cause a reload of the affected device. Note: On Cisco cBR-8 Converged Broadband Routers, all of the following are considered WAN interfaces: 10 Gbps Ethernet interfaces 100 Gbps Ethernet interfaces Port channel interfaces that include multiple 10 and/or 100 Gbps Ethernet interfaces
Credit: ykramarz@cisco.com
| Affected Software | Affected Version | How to fix |
|---|---|---|
| Cisco IOS XE | =16.7\(1\) | |
| Cisco cBR-8 |
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Reference Links
Frequently Asked Questions
What is CVE-2020-3509?
CVE-2020-3509 is a vulnerability in the DHCP message handler of Cisco IOS XE Software for Cisco cBR-8 Converged Broadband Routers.
What is the severity of CVE-2020-3509?
The severity of CVE-2020-3509 is high with a CVSS score of 8.6.
How does CVE-2020-3509 affect Cisco cBR-8 Converged Broadband Routers?
CVE-2020-3509 could allow an unauthenticated, remote attacker to cause the supervisor to crash, resulting in a denial of service (DoS) condition.
How can I fix CVE-2020-3509?
To fix CVE-2020-3509, it is recommended to upgrade to a fixed version of Cisco IOS XE Software.
Where can I find more information about CVE-2020-3509?
You can find more information about CVE-2020-3509 on the official Cisco Security Advisory page.
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- canonical/cisco cbr-8